Moving image playback system and image capturing apparatus

1. A moving image playback system comprising: an image capturing apparatus that can capture, at a predetermined frame rate, a plurality of moving images under mutually different image capturing conditions in parallel in use of one image capturing element; and a playback apparatus that played back moving images captured by the image capturing apparatus, wherein the image capturing apparatus comprises: a reference condition selection unit that selects one of the plurality of image capturing conditions to be used for capturing images as a reference condition when a total of image capturing time of one frame in each image capturing condition to be used for capturing images is longer than one frame period at the predetermined frame rate; and an image capturing control unit that captures images at the predetermined frame rate under the reference condition, out of the plurality of image capturing conditions, and captures images at a frame rate lower than the predetermined frame rate under the other image capturing conditions, out of the plurality of image capturing conditions, and the playback apparatus comprises: a playback moving image selection unit that causes a user to select a playback moving image, which is a moving image to be played back, out of a plurality of moving images captured by the image capturing apparatus; a detection unit that detects a motion between frames of a moving image captured under the reference condition when the image capturing condition of the playback moving image is an image capturing condition other than the reference condition; and a conversion unit that converts the frame rate of the playback moving image into the predetermined frame rate by generating an interpolation frame for interpolating between frames of the playback moving image based on the motion detected by the detection unit when the image capturing condition of the playback moving image is an image capturing condition other than the reference condition.

2. The moving image playback system according to claim 1 , wherein the reference condition selection unit selects an image capturing condition specified by the user, out of the plurality of image capturing conditions to be used for capturing images, as the reference condition.

3. The moving image playback system according to claim 1 , wherein the reference condition selection unit selects as the reference condition one of an image capturing condition with which ISO sensitivity is lowest, an image capturing condition with which angle of view is widest, an image capturing condition with which image quality is highest, and an image capturing condition with which resolution is highest, out of the plurality of image capturing conditions to be used for capturing images.

4. The moving image playback system according to claim 1 , wherein the reference condition selection unit selects as the reference condition an image capturing condition with which motion between frames can be detected most accurately, out of the plurality of image capturing conditions to be used for capturing images.

5. The moving image playback system according to claim 4 , wherein a level indicating detection accuracy of motion between frames is predetermined for each of the image capturing conditions, and the reference condition selection unit selects a condition with which the level is the highest, as the reference condition.

6. The moving image playback system according to claim 4 , wherein the plurality of image capturing conditions to be used for capturing images are selected by the user out of a plurality of image capturing conditions that can be set in the image capturing apparatus, and the image capturing apparatus further has an addition unit of adding, when an image capturing condition with which the motion between frames can be detected more accurately than the image capturing conditions selected by the user exists in the image capturing conditions which have not been selected by the user, this image capturing condition to the image capturing conditions to be used for capturing images.

7. An image capturing apparatus that can capture at a predetermined frame rate a plurality of moving images under mutually different image capturing conditions in parallel in use of one image capturing element, the image capturing apparatus comprising: a reference condition selection unit that selects one of a plurality of image capturing conditions to be used for capturing images as a reference condition when a total of image capturing time of one frame in each image capturing condition to be used for capturing images is longer than one frame period at the predetermined frame rate; an image capturing control unit that captures images at the predetermined frame rate under the reference condition, out of the plurality of image capturing conditions, and captures images at a frame rate lower than the predetermined frame rate under the other image capturing conditions, out of the plurality of image capturing conditions; and a storage unit that stores a plurality of moving images captured by the image capturing control unit.

8. The image capturing apparatus according to claim 7 , wherein the reference condition selection unit selects an image capturing condition specified by the user, out of the plurality of image capturing conditions to be used for capturing images, as the reference condition.

9. The image capturing apparatus according to claim 7 , wherein the reference condition selection unit selects as the reference condition one of an image capturing condition with which ISO sensitivity is lowest, an image capturing condition with which angle of view is widest, an image capturing condition with which image quality is highest, and an image capturing condition with which resolution is highest, out of the plurality of image capturing conditions to be used for capturing images.

10. The image capturing apparatus according to claim 7 , wherein the reference condition selection unit selects as the reference condition an image capturing condition with which motion between frames can be detected most accurately, out of the plurality of image capturing conditions to be used for capturing images.

11. The image capturing apparatus according to claim 10 , wherein a level indicating detection accuracy of motion between frames is predetermined for each of the image capturing conditions, and the reference condition selection unit selects a condition with which the level is the highest, as the reference condition.

12. The image capturing apparatus according to claim 10 , wherein the plurality of image capturing conditions to be used for capturing images are selected by the user out of a plurality of image capturing conditions that can be set in the image capturing apparatus, and the image capturing apparatus further has an addition unit of adding, when an image capturing condition with which the motion between frames can be detected more accurately than the image capturing conditions selected by the user exists in the image capturing conditions which have not been selected by the user, this image capturing condition to the image capturing conditions to be used for capturing images.